Construction of a wooden frame veranda.

[antoinet111]

seen vertically: a semblance of 3D (under paint)





well, I did it again:

[Ahmed]

Yes, this kind of assembly is very common in the manufacture of beams. Chatelot16, is surprised, but probably it is because it confuses with the use in thin parallel layers to obtain bent parts in the mold.

It is easy to cross these pieces by making semi-wooden assemblies: the thickness of a row of battens corresponds exactly to what must be removed.

Are you sure that your modification with rebate brings a significant gain in robustness?

[Obamot]

Against burglaries, on the veranda side, at home I have the "boa" framework:



no more theft to report since ...

[antoinet111]

Are you sure that your modification with rebate brings a significant gain in robustness?

no, I'm making assumptions.

and you what do you think?

[Did67]

I found an example of collage like mine !!!!

Your main problem, in my opinion, will be to stick in a sustainable way. This is done under strong pressure, it seems to me, with presses!

And you'd better have all your pieces at the same humidity, so that the wettest bend your set by shrinking more than the others. In general too, it is glued and then rectified ...

It always seems to me (I do not work at Ikéa, which was the great specialist in the recovery of small scrap wood in laminated - glued work plan. I have had such a plan since the early 80s. Never moved! )

[antoinet111]

for the bonding it will be with epoxy resin in press it is not a concern, it will be a good training for the construction of my future plane.

[dedeleco]

the glued laminate is made industrially and is complex, at, under high pressure with special glues, hot even with microwave !!

Otherwise surprises, because this technology is not trivial.

read:
http://en.wikipedia.org/wiki/Glued_laminated_timber
and:
http://www.aitc-glulam.org/glulam.asp

http://www.glulam.org/

http://www.glulam.org/L-industrie-du-Bo ... abrication

with the pro part inaccessible without showing white paw (see furious chatelot16)

Not the one in French insufficient !!

A significant development in the glulam industry was the introduction of fully water-resistant phenol-resorcinol adhesive in 1942. This allowed glulam to be used in exposed exterior environments without concern of gluline degradation. The first US manufacturing standard for glulam was Commercial Standard CS253-63, which was published by the Department of Commerce in 1963. The most recent standard is ANSI / AITC Standard A190.1-02, which took effect in 2002

not always perfect even with pros:
http://www.glulam.org/Documentations-et ... sionnelles

Our profession is confronted with an increasingly subjective appreciation of our Project Owners and Architects on the degree of importance of the cracks that appear on our glued laminated structures.

This is all the more troublesome when it is confirmed by the testimony of experts, who do not always have the knowledge and experience of pathologies resulting from cracking in the glued laminated timber element.

In their discharge, we can only regret the absence of an editorial support which analyzes the degrees of importance and the influence of the cracks on the strictly structural aspect of glued laminated timber works.

On the strength of this observation, we asked Mr. Gilbert VIDON, a former technical controller and expert in wood, to write us recommendations that make it possible to identify cracks detrimental to the performance of the structure in its environment and to indicate the repair procedure when these cracks affect the strength of the structure.

Process of fabrication
The manufacture of laminated wood
step 1: drying

Objective: stabilize the wood by bringing its humidity level at the level required for manufacturing (8 to 15% for untreated wood and 11 to 18% for treated wood).

Means : artificial drying cells, adapted to the species, the thickness of the slats, the initial humidity, etc. with regular checks.
step 2: tacking and abutting

Objective: to achieve the lengths necessary for manufacturing.

Method: after a purging operation consisting in eliminating the defects, the strips are cut and glued end to end (butted). The jointing is carried out using multi-finger joints (5 to 50 mm finger joints) with a current trend for short nails (10 to 15 mm). The minimum pressure for finger jointing is of the order of 20 bars.

Evolutions: the initial goal of the jointing was to put boards end to end (for easy handling). The technique has constantly evolved, and today aims to produce assemblies with high mechanical strength, whose controlled performance allows the qualification of the laminated wood composite material.
step 3: planing

Planing of beams - downstream pipe

Objective: obtain constant flatness.

Method: the planing of the slats is carried out at most 24 h before gluing. The maximum admissible deviation (thickness) over a length of strip of 1 m, is 0,1 to 0,2 mm.

Evolutions: contemporary planing systems make it possible to reach high planing speeds, and to best prepare the surface which will receive the adhesive during gluing.
step 4: gluing

gluing

Objective: assemble the slats together with a parallel wire.

Method: in the past, gluing was done manually. Today, this operation is carried out with curtain or roller gluing machines, ensuring uniform application.

Evolutions: contemporary techniques and materials allow precise and variable dosages. Manufacturers have the freedom to speed up, slow down or modify the grammage.
step 5: tightening and drying

tightening-and-drying

Objective: maintain the glued parts at the desired pressure in the desired shape during the adhesive polymerization time.

Method: the clamping of the slats on jigs to the shapes of the desired beams is done through hydraulic systems, allowing total control of clamping pressures.

Developments: conventional air drying is now supplemented by high frequency systems, reducing the drying time significantly. To further improve the performance of the production lines, rotary presses allow the glued strips to be placed and tightened with a new beam, while others are being dried.
step 6: planing

Objective: to obtain the final dimension of the beams.

Developments: the development of production tools has made it possible to increase planing widths (up to more than 2 meters), increase planing speeds, improve the quality of surfaces and mechanize the production line. manufacturing, upstream and downstream of the planing station.
step 7: size and finish

Size- Type 3

Objective: to obtain a beam ready to be delivered.

Method: these are the drilling operations (location for the assembly members), size (shape) and application of treatment and / or finishing products. Today, many solvent-free treatments and stains are available. They allow, on the one hand, the limitation of greenhouse gas emissions, on the other hand the improvement of working conditions within the workshops.

Evolutions: three types of machining center exist today depending on the work required:
- high speed machining of straight parts of less than 1m3
- complex machining of straight pieces over 1m3 but not exceeding 20m in length
- Machining frames for complex cutting of large, straight or curved parts or with variable inertia

epoxy resin in press

big risk of surprises and failed tests, to innovate on more than 200 years of technological progress, epoxy is often brittle.

I advise to be well informed, wood hygrometry, especially glue.

[antoinet111]

...

epoxy resin in press

big risk of surprises and failed tests, to innovate on more than 200 years of technological progress, epoxy is often brittle.

I advise to be well informed, wood hygrometry, especially glue.

big risk of surprise? we build planes like that, that's why I'm interested in technique (and also it would avoid buying beams).
I haven't had time to read everything yet.
Thank you

[Ahmed]

We must not confuse the constraints of manufacturing large structural elements (frame), with your simple assembly, not very problematic.
On your modification of a double batten with rebate, I have no reasoned opinion, only the impression that it is an unhelpful complication ...

[antoinet111]

As I told you, I have a stock of super straight and super dry Douglas fir cleats, nice junk.

and I don't want to pay beams that will not be dry to the core and that will spin due to the effect of heat, in contact with triple glazing, it does not forgive, they will fart one after the other.

that would save me a lot of money ....

it's already hot, the purchase of wood for the real frame (the structural), and everything around it is not necessarily super heavy, 500kg max spread over 25m².